Assertion (A): | A glass tube partially filled with water represents an open organ pipe. |
Reason (R): | The open end corresponds to an antinode and the end in contact with water, to a node. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True and (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
1. | 2πλa | 2. | 2πaλ |
3. | λa | 4. | aλ |
1. | 3:1 | 2. | 1:2 |
3. | 2:1 | 4. | 1:3 |
1. | 8:9 | 2. | 9:7 |
3. | 9:8 | 4. | 7:9 |
A string of length l is fixed at both ends and is vibrating in second harmonic. The amplitude at antinode is 2 mm. The amplitude of a particle at a distance l/8 from the fixed end is:
1. 2√2 mm
2. 4 mm
3. √2 mm
4. 2√3 mm
In a guitar, two strings A and B made of same material are slightly out of tune and produce beats of frequency 6 Hz. When tension in B is slightly decreased, the beat frequency increases to 7 Hz. If the frequency of A is 530 Hz, the original frequency of B will be:
1. | 524 Hz | 2. | 536 Hz |
3. | 537 Hz | 4. | 523 Hz |
The length of the string of a musical instrument is 90 cm and has a fundamental frequency of 120 Hz. Where should it be pressed to produce a fundamental frequency of 180 Hz?
1. | 75 cm | 2. | 60 cm |
3. | 45 cm | 4. | 80 cm |
1. | 500 m/s | 2. | 156 m/s |
3. | 344 m/s | 4. | 172 m/s |